Compound spinning bobbin



Oct. 9, 1962 c. SCAGLIA COMPOUND SPINNING BOBBIN i Filed March 11, 19602 Sheets-Sheet 1 s4 5 w 18q A 30 180.32 4 s2 2 Oct. 9, 1962 Filed March11, 1960 C. SCAGLIA COMPOUND SPINNING BOBBIN 2 Sheets-Sheet 2 UnitedStates Patent F 3,057,576 COMPOUND SPINNING BOBBIN Camille Scaglia,Bremhilla, Italy, assignor to M. Scaglia,

Societa per Azioni, Brembilla, Italy, a joint-stock company of ItalyFiled Mar. 11, 1960, Ser. No. 14,232 9 Claims. (Cl. 242118.6)

The invention relates to bobbins adapted for holding large quantities ofyarn wound thereon. More particularly, the bobbins are adapted forhaving yarn of synthetic fibers wound thereon.

When winding synthetic fibers on bob-bins, there is caused high stresseson the bobbius flanges which may cause separation of the bob-binsflanges from the bobbins cores.

It is an object of the invention to provide a bobbin wherein the flangeand core are assembled elements of different material but yet areinseparable under the pressure exerted by yarns of synthetic fibers Whenthe same is wound on the bobbin.

It is a further object of the invention to provide a bobbin as abovedescribed and wherein there is provided means for preventing entry ofyarn into fissures between the core and flanges caused by the pressureof the yarn against the flanges.

It is a feature of the bobbin according to the invention that yarn ofsynthetic fibers can be wound continuously on the bobbin withoutbreaking and loss of yarn.

It is a further feature of the bobbin according to the invention that itis easily manufactured and economical to produce.

According to the invention the bobbin comprises a tubular core elementand a flange element on and encircling the core element. Only one of theelements is metallic. The bobbin additionally comprises means forsecuring the flange element to the core element to resist forces appliedto the flange element by yarn wound on the bobbin and means forpreventing entry of the yarn on the bobbin into the fissure formedbetween the flange element and the core element when the flange elementis deflected under the action of the force exerted by the yarn wound onthe bobbin.

More particularly, the above-noted means are constituted by an annularprojection on and integral with the core element and extending radiallyoutwardly thereof. The projection includes an inner ridge extendingperpendicularly from the core element radially outward. A plu rality ofteeth are provided on the projection extending radially outwardlytherefrom. The flange element is provided with indentations foraccommodating the teeth on the projection. The inner face of the flangeelement is coplanar with the ridge when the teeth are enmeshed in theindentations. Furthermore, the outer face of the flange element istapered in part to form a seat and the core element includes an endportion which is engaged in the seat such that the flange element isretained against movement longitudinally along the core element by theannular projection and the end portion.

The manufacturing procedure of the bobbin defined above is characterizedby the following steps; a first series of shoulders is formed on bothends of the metal core; opposite seats are cut in the flange bores; bothends of the metal core are inserted into such bores; the jutting sections of the core edges are flanged to bring them into engagement withthe seats formed on the flanges, and finally plugs of resilient materialare forced into the core ends, wherein they are held by the springreaction exerted by the core ends and by the associated flanges.

Several embodiments of the invention are shown in .the accompanyingdrawings, which embodiments are in- 3,057,576 Patented Oct. 9, 19 62 icetended to be descriptive of the invention and are not to be taken asrestrictive of the invention.

In the drawings:

FIG. 1 is a partial sectional side elevation view of one of the bobbinends.

FIG. 2 is a partial sectional side elevation view of a bobbin section,in the process of manufacture.

FIG. 3 shows a partial sectional side elevation view of a furtherembodiment of the bobbin.

FIG. 4 shows the bobbin of FIG. 3, just before the flanges are securedto the core.

FIG. 5 is a view of the bobbin in FIG. 3 showing in detail therelationship between the flange and the core when the flange issubjected to stress by the yarn.

FIG. 6 shows the bobbin as seen in the direction of arrow VI of FIG. 5.

FIG. 7 is a vertical sectional view of apparatus for forcing the plugsinto both bobbin ends.

The bobbin as shown in FIGS. 1 and 2, comprises a metal core A,preferably of aluminium or its alloys, Whereon the flanges B, of wood orlike suitable material, are secured. The flanges are positively held onboth core ends by peripheral projections 10, formed near the ends ofcore A.

Each flange B is provided with a bore 12, wherein the end 14 of core Ais inserted as explained in more detail hereinafter. A seat 16 is formedin the inside portion of the bore 12 to accommodate the previouslydescribed shoulder 10. A further larger seat 18 (see FIG. 2) with asteep wall, is formed on the outer portion of the bore, to accommodatethe flanged edge 20 (FIG. 1) of the core end 14. V Plugs C, of suitablyresilient material, are forced, in the manner which will be described inmore detail hereinafter, into both ends of core A. It has been foundthat wood is the most suitable material for the plugs with the fibers ofthe wood running parallel to the axis of core A. Consequently, the plugprovides practically uniform elasticity in all different radialsections. The outside diameter of plug C should be slightly larger thanthe inside diameter of the bore 12 or the core A. An axial bore 22 isprovided in plug C. Plug C has a leading edge 24 formed in one endthereof, while a peripheral slot 26 is cut in the opposite end.

The core A is preferably formed from a metal tube, and the flanges aremachined preferably from wood.

The flanges B are secured to core A in the following manner: The flangesB are forced on both ends 14 of core A until the seat 16, on each flangeis engaged against the shoulder 10, and the adjacent portion of the coreperiphery, as shown in FIG. 1. Thereafter, the edge of core end 14 isformed with a flange and brought into contact with the wall of seal 18of flange B to tightly secure the flange B onto the end of core A.

The bobbin is then placed into a bush (see FIG. 7) constituted by twosymmetrical portions 50 and 52, having ends with crowns 54 provided withsuitable abutments 56 for accommodating the flanges B.

The bush 5052, with the bobbin inserted therein, is fitted on a baseplate 60, by inserting one of the crowns 54 into a seat 58 formed on thebase plate. A ring 62 formed with a seat 64, similar to seat 58, andadapted for accommodating crown 54 of the bush, is placed on the upperend of the bush. Thus, both halves 50 and 52 of the bush are securedtogether to firmly support the bobbin therebetween.

A crown 66 on the upper end of ring 62 is formed with a flared bore 68,which has a smaller minimum diameter than the inside diameter of thetapered portion 14 of core A. The plug C is inserted into the bore 68,and is then forced thereinto, by a plunger 70 provided with a referencepin 7-2 until the groove 26, around the plug pe 3 riphery, engages theannular projection on the core end 14.

The plug C, due to its inherent elasticity undergoes compressionshrinkage when it is forced into the bore 68 of ring 62. When the bottomof bore 68 has been reached by the plunger 70, the plug C is whollyinserted into the bore of core A, and groove 26 is engaged with theannular shoulder on the core end 14. The plug, due to the elasticpressure forces the end portion thereof against the bore 12 of flange B,thus positively ensuring the connection between the core A and theflange B.

After having removed the ring 62, the half-bushes 50 and 52 can bedisengaged from base plate 60, and the bobbin can be removed. The bobbinis then subjected to finishing operations. Thus, for instance, the sidesof flanges B are turned and burnished, while the plugs C are anchored tocore A by internings 28.

In FIGS. 3 to 6 there is shown a modified embodiment of the bobbin,wherein similar or equivalent components are given the same referencedesignations.

In the embodiment in FIGS. 3-6, the core A near its ends is formed withprojecting ridges 30, the inside walls thereof being substantiallynormal to the axis of core A.

Both ends 32 of said core are knurled, as shown in FIG. 4. As in theembodiments in FIGS. 1 and 2, the ends of the core A are flanged andengage the wall of a seat 180, formed on the flanges B.

According to the invention, the upper ends of the peripheral projections30 are formed with radial, or substantially radial serrations 34,adapted to mesh with a similar, complemental serration 36, formed on aportion of the bore of each flange B.

The above construction prevents, in a simple and eflicient manner, theyarn from being caught; in the fissure formed (as a consequence of thepressure exerted by the yarn wound on the bobbin) between the flange Band the core A. In the embodiment of FIG. 4, when the flange B isdeflected, a discontinuous or zigzag fissure is formed between theflange and the core A, due to the presence of radial serrations 34 and36, which prevents the yarn from entering into the fissure, even whenthey are pressed against the fissure by the superposed yarn layers.

The above bobbin is manufactured in like manner as the bobbinillustrated in the FIGS. 1 and 2.

It is to be understood that modification and changes may be made in theembodiments described, particularly with regard to the manner in whichthe flanges are secured to the core.

Similarly, changes might be made in the form and arrangement of theserrations without departing from the spirit of the appended claims.

What I claim is:

1. A bobbin comprising a tubular core element, a flange element havingan opening and encircling the core element, only one of said elementsbeing metallic, said flange element having an inner and outer face, anannular projection on and integral with the core element and extendingradially outwardly thereof, said projection including an inner ridgeextending perpendicularly from said core element radially outwardly, aplurality of teeth on said projection extending radially outwardtherefrom, said flange element being provided with indentations foraccommodating said teeth, the inner face of said flange elements beingcoplanar with said ridge with the teeth in said indentations, the outerface of said flange element being tapered in part to form a seat, saidcore element including an end portion engaged in said seat, said flangeelement being retained against movement longitudinally along the coreelement by said annular projection and said end portion.

2. A bobbin comprising a tubular core element, a flange element havingan opening and encircling the core element, said elements being ofdissimilar materials only one of which is metallic, an annularprojection of quadrilateral shape on and integral with the core element,the projection including a ridge extending perpendicularly from saidcore element in a radially outwardly direction, a plurality of teeth onsaid projection and extending radially with respect to the core element,said flange element being provided with indentations for accommodatingsaid teeth, said flange element having a face which is coplanar withsaid ridge with the teeth in said indentations, said core elementincluding an outwardly flaring end which defines a space with saidprojection, said flange element having a shape corresponding to that ofsaid space and extending therein with said teeth engaged in saidindentations so that said flange element is prevented from movingrelative to said core element.

3. A bobbin as claimed in claim 2 comprising a resilient plug in thetubular core element, said plug urging said core element into contactwith said flange element to lock said elements together.

4. A bobbin as claimed in claim 2 wherein said projection includes afurther ridge facing said flaring end of the core element, said furtherridge being inclined with respect to said core element so that saidspace is divergent radially outwardly.

5. A bobbin as claimed in claim 2 wherein said outwardly flaring end ofthe core element is knurled to provide increased resistance to relativemovement between said flange element and said core element.

6. A bobbin as claimed inclaim 3 wherein said plug is normally largerthan the tubular core element, said plug being compressed in saidtubular core element whereby said plug exerts radial forces on saidtubular core element.

7. A bobbin as claimed in claim 2 wherein said flange element is wood.

8. A bobbin as claimed in claim 2, wherein the core element has oppositeends and a flange element is at each end.

9. A bobbin as claimed in claim 2, wherein said teeth are of triangularshape.

References Cited in the file of this patent UNITED STATES PATENTS898,398 Wood Sept. 8, 1908 1,700,593 Oliver Ian. 29, 1929 1,839,223Jones Jan. 5, 1932 1,892,356 Mills Dec. 27, 1932 2,000,372 Beck May 7,1935 FOREIGN PATENTS 500,530 Italy Nov. 19, 1954 777,289 Great BritainJune 19, 1957 1,163,894 France May 5, 1958

